To produce pea plants that only display the recessive phenotype of a trait, what must be the genotypes of the parent plants? a: tt and tt b: tt and tt c: both must be tt d: both must be tt

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Are the layers of rock above and below the coal older or younger?

Blank is a rock with a find dark texture that makes up the oceanic crust